Hard pull is a good indication of great compression. Under certain conditions, particularly if the chainsaw is used regularly and not maintained, you will have trouble starting the Stihl MS 290. Definitely get fresh gas, 3 months is about the best of useful life for a chainsaw. Activate the choke by moving the lever to the full choke position and pull the starter rope 3 or 4 times to start the engine. After a few minutes, you can often simply pull the crank cord again with everything on, including the throttle pressed in along with its interlock. You will notice the compression less. Once started, they both run fine, revving quickly and running cleanly at full throttle. I bought another 395 about a month ago, the compression switch hasn't blown yet, and there is no noticeable power difference. my brand new poulan chainsaw will not start and it is hard to pull and jerky sometimes. When you go to replace the cover pull the cord out 3-5 inches, or just as it first starts to compress, and then secure the cover. Pull on the starter rope until the compression reading maxes out. If the saw turns over freely with the plug out but not with it in, the only difference has to be the compression. (In comparison, an 036Pro I checked had 166 psi). This relieves engine compression and makes it easier to pull the recoil starter. When operated correctly, the Stihl MS 290 will start without problem. it is worse when cold starting but sometime even hot restart is a problem,it will pull the start rope out of your hand. Maybe you have a compression problem. Thankyou. Place your chainsaw on the ground, and slowly lift it with the starter rope. Carboned rings will decrease not increase compression. I've bought some needed parts for this chainsaw which include a spark plug, air filter, a fly wheel and key and the body cover. There was essentially no drag caused by the clutch mechanism. If you feel confident in doing so, and can keep track of all the parts and how to reinstall, it is an interesting afternoon's pursuit to disassemble, clean and reassemble a chain saw. Try removing the spark plug, tip the saw upside down and pull over hard, this will clear the bottom end of any residual fuel. To keep these parts moving, a certain amount of compression is needed. In attempting to troubleshoot this condition, I removed the spark plug and I found it very easy to pull. I screwed in a compression gauge and got 188 psi. The saw has more than enough gas at the right place and too much is the problem. My Stihl is hard to pull also, I think that is a Stihl trademark with high compression, but it starts with only a couple of pulls (choke pull, move to run, pull and it usually fires up) Don't flood it though or you will be pulling several times to clear the carb. Recently my two 2-stroke blowers (Echo PB-250LN and Hitachi RB24EAP) have been requiring very high effort to pull the starter cords. I've had a few ideas along the way that I thought fixed the problem, only to find out I was wrong. i changed the plug and its really hard to pull If the energy of the pretensioned spring is greater than the opposing force created by the piston during compression, the crankshaft starts to turn and the engine attempts to fire. 21 - … Sounds like too much compression to me. Before you scrap the chainsaw or send it somewhere for expensive repairs, first try these common fixes to troubleshoot your tool. They feel like super high compression large 4-strokes where I can clearly feel every compression stroke as I pull the cord. Jump to Latest Follow Status Not open for further replies. In contrast to the standard starting system which requires quick or uneven movements to activate it, the STIHL Easy2Start™ helps pull the starter rope smoothly and evenly all the way out. In addition to the Husky saws I have one Stihl MS 880 and I hate it. Chainsaw starting rope is hard to pull. A compression release in the combustion chamber of the cylinder head is for down hill braking old school style. It pulls so hard against the compression that I can't believe the recoil string doesn't snap or pull … I have an older model Craftsman 46cc 20 inch chainsaw that is acting like it has way too much compression when trying to pull the pull chord. If your chainsaw is not starting when you pull the starter rope, and you’ve checked the above, there may be a problem with the compression. If that doesnt work, than you have bigger problems. My small Stihl chainsaw has to much compression, it used to be ok and used to run well before I put it away in a bag about 6 months ago, however , it now needs a foot in the handle and pressure on the top just to pull the starter.After taking the sparkplug out, its easy to pull… Chainsaw letdown is real. To one side of your Stihl chainsaw, you’ll find a small, translucent plastic bubble. Slowly raise the chainsaw with a starter rope. Probably the "decompression" valve is blocked with gunk. Its not seized, its just that hard to turn over. Most chainsaws will operate well with compression readings that range from 100 to 160 psi. There's nothing like the feeling of being all fired up, ready to cut some stuff, only to pull back that chain and realize your saw won't start. In this video I am putting a new carburetor on my 16" chainsaw. Old school head mounted ones were'nt used for starting or aiding in starting, If it's cable operated, It releases a bit too much compression to let the engine start up properly IMO. I pulled the plug, and it spins over freely. Sorry for the quality and handling of the video. It is recommended that you give your saw a regular hard run, especially for the smaller models. Is there a built-in compression releaf and where located? on it the pull rope has always been verry hard to pull as if the timeing was to advanced is that possible? Cranking a depressed chain Compression is generated by the engine via the crankcase and the combustion chamber. Is a service manual available? Compression Problems. If a flooded chainsaw is your problem, no extra gas is needed—DO NOT be tempted to prime the saw again. An inexpensive 1" paint brush and a container of mineral spirits will make cleaning much easier. Save Share. It ran once for about 5 minutes then it died and i cant get it to even try to start. The easier pull on older saws can mean that the piston or cylinder needs replacing (if it's running well/has … This is the primer bulb and is used to remove air from the fuel pipe, so that it can flow to the carburetor. If that doesn't work, move the choke lever to half choke and pull the starter rope, 6 times maximum, to start the engine. Clean the parts. Reboot Saw and Turn Everything Off . What is the usual amout of pressure on compression on a brand new chainsaw. How long do you think that piston will last. Here’s how you can check the compression level of your chainsaw. Try to start the chainsaw after priming the carburetor. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Could it have malfunctioned to increase the compression. The compression on the saw i am wanting to buy is 125 lbs. 5. My Craftsman Chain Saw (model# 358.357181) just developed a problem while attempting to pull-start saw. 21 - 24 of ... and would raise the compression enough to be hard to start with the plug in it, plus hard to run once started. ... Of course, because no compression, but I don't feel the drag or resistance with the plug out which leads me to beleive the motor all the sudden has too much compression. Of course, before pulling cyl., pull muffler & inspect cyl. Chainsaws often get compressed due to clogged fuel or air leak in the engine. The compression gauge hooks up to the cylinder via the spark plug hole. Get shopping advice from experts, friends and the community! Below 90, ng. ... Push the throttle at halfway and pull the rope until the saw is running. Stihl 250, compression/pull starting issue So much so that I can't pull start it more than a few times before the rope breaks. The only problem now is that when I try to start it theres a lot of compression and it very hard to pull. A compression gauge works much like a tire gauge, reading the pressure inside the engine. 4. If not, THEN it's time for a compression test, done accurately: soft-spring schrader core in cylinder end of tester, engine warm, throttle open, cranked until reading settles. The Stihl MS 290 chainsaw is a useful tool for working around the house, particularly when landscaping. I have a Stihl MS 440 chainsaw with no compression release,when I try to start it the pull cord is ripped out of my hand - Answered by a verified Technician We use cookies to give you the best possible experience on our website. I put the spark plug back in the engine, and although I could pull the rope, it pulled very hard, but I could hear the compression, so I bought it. I have a Stihl ms-250 saw with about 10 hrs. After getting it home, I took the spark plug out again, and sprayed some PB Blaster in the cyl. Redmax 8500 pulls super hard-not pull rope-Please Help. Reply. I was wanting to buy a chainsaw for parts to fix my old homelite super xl automatic. Place the chainsaw on the ground. I had a problem at first with the pull rope which wouldn't budge but I sorted it and it work now. and added some very light oil, like sewing If you tighten the cover without pulling cord out slightly, alot of times with some saws you wont be able to pull it at all. Compression is essential for managing the overall spark and fuel systems. The pull-rope is extremely hard to pull. Get shopping advice from experts, friends and the community! my craftsman chainsaw (model 358.357181) has become difficult to pull start due to higher compression. With the carb and muffler off and plug in, it still is a bear to pull. & ring(s) through port. A petrol powered chainsaw has several moving parts. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. Not only is it hard to pull and the compression switch a must, but the air filter clogs up in 30 seconds when pulling my 96", 66", and 59" bars. How To Check.
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